OpenShift Pipeline Library

• OpenShift Pipeline Library
  • Overview
  • Prerequisites
  • User Guide
    • Examples
      • Deploy stand-alone application
      • Deploy stand-alone application with external configuration
    • How to use this library
  • API
    • osio
    • config
    • plugins
    • ci
    • cd
    • processTemplate
    • loadResources
    • build
    • deploy
    • spawn
  • Contribution Guide
    • Dev Setup
    • Test

Overview

This repository provides a set of pipeline functions (pipeline library) that are used in Jenkinsfile to do Continuous Delivery / Continuous Integration for OpenShift.io applications. This pipeline library can be used with any OpenShift cluster which adheres following prerequisites.

Diagram

PlantUML

Prerequisites

• OpenShift command-line interface (oc binary) should be available on Jenkins master or/and slave nodes.
• Jenkins should have following set of plugins
  • Pipeline Model Definition Plugin
  • Kubernetes Plugin
• Familarity with writing Jenkinsfile, basic groovy syntax and Jenkins pipeline.

User Guide

Examples

Following are some example Jenkinsfiles to illustrate how to use this pipeline library.

Deploy stand-alone application

The following example builds a nodejs booster and deploys it to a stage environment and then on approval to the run environment.

@Library('github.com/fabric8io/osio-pipeline@master') _

osio {

  config runtime: 'node'

  ci {
    // runs oc process
    def resources = processTemplate()

    // performs an s2i build
    build resources: resources
  }

  cd {
    // override the RELEASE_VERSION template parameter
    def resources = processTemplate(params: [
        RELEASE_VERSION: "1.0.${env.BUILD_NUMBER}"
    ])

    build resources: resources

    deploy resources: resources, env: 'stage'

    // wait for user to approve the promotion to "run" environment
    deploy resources: resources, env: 'run', approval: 'manual'
  }
}

Deploy stand-alone application with external configuration

The following example build and deploy a nodejs application like previous one. It also loads an external resource like configmap and deploy it to stage and run environments.

@Library('github.com/fabric8io/osio-pipeline@master') _

osio {
    config runtime: 'node'

    ci {
        def app = processTemplate()

        build app: app
    }

    cd {
      def resources = processTemplate(params: [
        release_version: "1.0.${env.BUILD_NUMBER}"
      ])
      def cm = loadResources(file: "configmap.yaml")

      build resources: resources

      // deploy API takes multiple resources in array form
      deploy resources: [resources,  cm], env: 'stage'

      // wait for user to approve the promotion to "run" environment
      deploy resources: [resources,  cm], env: 'run', approval: 'manual'
    }
}

where configmap.yaml is

APIVersion: v1
kind: ConfigMap
metadata:
    ...
    ...

loadResources API also supports List kind like following one where configurations.yaml is

APIVersion: v1
kind: List
items:
  -kind: ConfigMap
    ...
  -kind: Secrete
    ...

How to use this library

To use the functions in this library just add the following to the top of your Jenkinsfile:

@Library('github.com/fabric8io/osio-pipeline@master') _

That will use the master branch (bleeding edge) of this repository.

API

The following API's are declared in this repository. A little description and example is provided for all

osio

This is the first functionality we use in the JenkinsFile. Everything we want to do with our pipeline, we write that in this block. This block will register all the plugins then emit an event of pipeline start and execute whatever you have specified and then emit an event of pipeline end.

    osio {
        // your continuous integration/delivery flow.
    }

config

This is the API where you provide configurations like runtime or something like global variables. This will be used further by default for spinning up pods to execute your commands or your flow.

    config {
        runtime: 'node'
        version: '8'
    }

If above block is configured in your pipeline then every time the spined pod will have a container named node which having the environments for nodejs8. By default pod will be spined with basic utilities like oc, git etc

Variables Configured in Pipeline

plugins

This is the API where you can provide the configuration related to the plugins. You can provide the configurations as map of key value pairs assigned to a plugin name

    plugins analytics: ["disabled" : true]

    plugins foobar: ["foo" : "bar"]

or

    plugins analytics: ["disabled" : true], foobar: ["foo" : "bar"]

Note : This needs to be specified outside of osio block in Jenkinsfile

Right now, the library is using the analytics plugins, which is by default enabled but can be disabled by setting disabled: true

ci

This is the block which will be executed for continuous integration flow. By default all branches starting with name PR- will go through this execution. You can override by providing a branch name in arguments

    ci {
       // Your continuous integration flow like run tests etc.
    }

To override the default branch for this flow

    ci (branch: 'test'){
       // Your continuous integration flow like run tests etc.
    }

Parameters

cd

This is the block which will be executed for continuous delivery flow. By default this gets executed for master branch. You can override by providing a branch name in arguments

    cd {
       // Your continuous delivery flow like run tests, generate release tag etc.
    }

To override the default branch for this flow

    cd (branch: 'production'){
       // Your continuous delivery flow like run tests, generate release tag etc.
    }

Parameters

processTemplate

processTemplate runs oc process on the OpenShift template pointed by file parameter and returns a representation of the resources (internals can change in future). All mandatory parameters required to process the template must be passed in as params.

    def resources = processTemplate(
      file: 'template.yaml',
      params: [ release_version: "1.0.${env.BUILD_NUMBER}" ]
    )

Parameters

Following template parameters must be present in the template and is set to the following values by default. You can override them by passing key value pairs in params.

Default Template Parameter

NOTE : processTemplate API expects a RELEASE_VERSION parameter in OpenShift template. This parameter is used to tag an image in build API and then to refer the same image in deploy API while building and deploying an application.

loadResources

loadResources returns a list of OpenShift resources read from a yaml file. This API returns resources list in the form of an array where every array element is a key value pair of resource kind and resource array itself. This API can read multiple resources separated by --- from the yaml file.

    def resource = loadResources(file: ".openshiftio/app.yaml")

Parameters

build

This is the API which is responsible for doing s2i build, generating image and creating imagestream (if not exist)

    build resources: resources, namespace: "test", commands: """
          npm install
          npm test
    """

or like

    build resources: [
                [ BuildConfig: resources.BuildConfig],
                [ImageStream: resources.ImageStream],
        ], namespace: "test", commands: """
            npm install
            npm test
        """

All the commands and s2i process gets executed in a container according to the environments specified in config API otherwise default.

Parameters

deploy

This is the API which is responsible for deploying your application to OpenShift.

    deploy resources: resources, env: 'stage'

or like

    deploy resources: resources, env: 'run', approval: 'manual', timeout: '15`

Parameters

The route generated after above step will be added as annotation in the pipeline.

spawn

This is an API to spawn an pod as per requirement and execute the commands in the pod.

    spawn (image: 'oc`) {
          sh """
              oc version
          """
    }

or like

    spawn image: 'java`,
          commands: "java -version",
          envVars: ["a":"b", "MAVEN_OPTS": '-Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn']

Either one of commands or closure needs to be specified.

Parameters

NOTE: For oc image, as an optimization, a new pod is not started instead commands and body are executed on master itself

Contribution Guide

We love contributors. We appreciate contributions in all forms :) - reporting issues, feedback, documentation, code changes, tests.. etc.

Dev Setup

1. Install maven (v 3.0 +)
2. Clone this

   git clone git@github.com:fabric8io/osio-pipeline.git

3. cd osio-pipeline
4. Import it maven project in your favorite IDE. We reccomond Intellije IDEA.
5. Make changes in code according to following conventions
   • vars -> Provides an end user pipeline API's
   • src -> Contains the the code used inside pipeline API's
   • test -> Contains unit tests for all source code

Test

To run the unit tests, execute

mvn test